Bucket spinning guide



July 8, 1947.

s. C. NELSON BUCKET SPINNING GUIDE -Filed June 1,. 1945 SINGLE PLANEPRIOR 'ART RDTARY VIERATIUN IN V EN TOR.

Patented July 8, 1,947

I UNITED STATES PATENT OFFICE Seddon C. Nelson, Front Royal, Va.,asslgnor to American Viscose Corporation, Wilmington, Del., acorporation of Delaware Application June '1, 1945, serial No. 597,070

. 2 Claims.

. I 1 This invention relates to an improved guide those being producedon anartificialillament spinning machine, into a spinning bucket orcentrifugal pot.

The normal bucket` or pot spinning process involves extruding a spinningsolution, such as oi' viscose, through a coagulatingmedium to formthreads composed of a' number of filaments. These threads are thenwithdrawn from the coagulating medium, stretched between driven godetsin the usual manner, and collected in a rapidly rotating bucket. Athread-guide or spinning funnel is mounted for reciprocation of itslower end axially of the bucket, and this funnel is adapted to guide thethread into the bucket in a manner to cause the thread to be laid up inthe form of a cake, due to the centrifugal force created by rotation ofthe bucket.

In practicing the bucket or pot spinning proc- 4ess in which a standardtype spinning funnel is utilized, it has been found that the thread asit'is fed into the bucket from the last godet with which it contactswill normallycommence twistlng or ballooning at the lower outlet of thefunnel, and this action is carried back to the godet wheel as a'vibration having the same frequency as the speed of rotation of thethread course extending between the funnel outlet and inside cake wall.When the funnel is oil-center, that is, positioned eccentric of thespinning bucket, another vibration wave having half the frequency ofthat caused by the rotation of the thread around the lower outlet of thefunnel is superimposed thereon. Such twisting or ballooning actioncauses vibrations or fluttering to exist in the thread, which tend todisturb the smooth passage of the thread. Furthermore, due to thevibrations acidic treating liquids are thrown therefrom. These liquidsprecipitate salts on the surrounding apparatus and additionally theacids will corrode any metallic parts with which they come in contact.

It has heretofore been suggested to provide one or more rods across themouth of the funnel to dampen the vibrations. However, such arrangementshave not produced suiiicient improvement to come into general use.` Someamelioration could be obtained by making the outlet opening of thefunnel of small diameter approaching the diameter of the thread, butlacing difliculties then became too serious to make this solutionpractical.

It is the object of the present invention to provide an improvedthread-guide which eliminates (ci. 5141s) i'or introducing continuousillaments, such as 1 substantially entirelyv all the vibration in thethread above .the vfunnel caused by the rotation of the thread leavingthe funnel. A further object is to provide a guide which eliminates the`vibration just mentioned so completely that any olf-center -position ofthe guide ls immediately perceptible to the naked eye simply by virtueof the distinct vibration thus induced. Further objects and advantageswill be apparent hereinafter.v

In the drawing which is illustrative of the inl vention,

Figure 1 is an elevation illustrating the operation of a conventionalfunnel thread-guide:

Figure 2 is a similar elevation illustrating the proper operation of aguide of the present invention;

Figure 3 is an elevation of a preferred form of guide embodying thepresent invention;

Figure 4 is an elevation of the guide looking at it from a direction 90from that by which Figure 3 is obtained; andv In Figure 1, thevibrations of 'the thread 2 proceeding from godet 3 to the rotatingspinning bucket 4 through the conventional funnel guide 5 are indicatedby the dotted lines which proceed upward from the thread outlet 6 of theguide. The effect produced appears to the naked eye as a blurred rapidlyfluttering or vibrating thread.

Figures 2 to 4 show a guide embodying the present invention in which atleast four projections 1 extend inwardly in as many directions fromlongitudinally spaced portions of the wall of thev tubular body 8 of theguide. The innermost portion of each projection has the form of a ridgeextending transversely across the guide and when it is desired that thethread pass approximately centrally through the body of the guide, theprojections extend either through its axis or preferably through pointssomewhat beyond its axis and the ridges of at least two oi' theprojections are arranged to extend transversely and in the preferredembodiment substantially at right angles, to those of at least two otherprojections, so that the thread in passing through the guide mustcontinuously contact all the ridges and is deflected from a straightpath through the guide to a zigzag path by the projections. It is notessential that the guide be cylindrical or that the thread pass amarsithrough its center or axis. though this embodiment is. preferred from apractical standpoint. Figure 2 shows the effectiveness of the guide inpreventing the development of vibrations because of the rotation of thethread leaving the outlet of the guide. This eiectiveness is apparentlythe result of one pair of parellel ridges preventing vibrations in anyplane except that of the ridges, while the other pair of ridgessupplements this action by preventing vibration in the plane of the rstpair of ridges.

As shown in Figures 3 and 4, the parallel ridges of each pair areadjacent to each other.

.. herein is illustrative only and that changes and The projections maybe formed in glass or v thermoplastic resin guidesimerely by pressingin-` dentations into the glass or resintube vwhile in a heated plasticcondition.` Alternatively, suitably shaped projections maybe insertedinto tubular guides and cemented into place `at spaced intervalstherein. The distance between ridges is generally not critical, and itmay be from about 1/ inch to 1 inch even up to 21/2 inchesor more.

The guide of the present invention does not variations may be madewithout departing from the spirit and scope of the invention as definedby the appended claims. j

I claim: i

1. A thread guide having a tubular body providing a longitudinal passagefor the thread, at least four projections longitudinally spacedwithinthe passage, each extending inwardly in one of four directions atleast through the axis of the passage and having a ridge extendingtransversely of the passage and adapted to engage the thread, the ridgesof atleasttwo adjacent projections being. parallel and at least twoother adright anglesto the nist-mentioned parallel ridges.

2. A thread guide having a tubular body prof viding a longitudinalpassage for the thread.

' four projections from the inside wall of the body interfere greatlywith the vibrations resulting from eccentric disposition of the. guidewith respect to the bucket because they are caused by `alternate changesin tension as the thread leaving the guide'must take agreater or shorterpath to reach thefcake winding and thereby exerts greater or lesscentrifugal-force. As illustrated in Figure 5, these vibrations becomereadily apparent to the operator who immediately recognizes that theguide requires centering. In this manner, the guide of the presentinvention itself becomes a highly eflicient tell-tale as to impropercentering of the guide.

It is to be understood that the description longitudinally spaced withinthe passage, each extending inwardly in one of four directions beatright anglesfto the mst-mentioned parallel j ridges.Y

SIEZDDON C. NELSON.

REFERENCES CITED The following references le ofthis patent:

FOREIGN PATENTS Number Country Date 330,130 nGreat Britainl June 5, 1930are of record in the

